MTN Most pathetic service provider!

I have been trying to upgrade my contract since 23 December. I have completed the necessary procedures on three occassions, the last one being Friday 27 January 2023. When the delivery company arrived this morning there was yet another problem. I have been trying to phone MTN's customer care for the last 50 minutes with no response. I have been transferred from the one person to the next with no positive outcome. MTN cannot deliver neither does it provide efficient client service. I have emailed MTN about my complaint - also no response.